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October 13, 1987 AGS 87050-2 <br /> �9 USA Station No. 65, Lodi, California <br /> PREVIOUS WORK <br /> FOak <br /> Pacific Environmental Group (PEG) of Santa Clara, California <br /> conducted a preliminary environmental investigation in March <br /> 04 1987. This investigation included drilling four boreholes, <br /> installing two ground-water monitoring wells, and sampling soil <br /> and ground water for laboratory analyses. Two boreholes (S-A and <br /> #4 S-B) were drilled to a depth of 20.0 feet, and two boreholes were <br /> drilled to a depth of 50.5 feet. Ground-water monitoring wells <br /> S-1 and S-2 (2-inch inside diameter) were installed to a depth of <br /> E, approximately 49 feet in the two deeper boreholes. The static <br /> ground-water surface was at an approximate depth of 38.5 feet in <br /> wells S-1 and S-2. The locations of the PEC boreholes and <br /> [a monitoring wells are shown on the Generalized Site Plan and <br /> t copies of Pacific Environmental's borehole logs and well <br /> construction details are included in Appendix A .of this report. <br /> A soil sample collected from S-1 at a depth of 39 feet was <br /> analyzed and found to contain 230 parts per million' (ppm) total <br /> +1 <br /> g� hydrocarbons. Samples from the same depth in S-2, from the <br /> t <br /> 18,5-foot depth in S-A, and from the 9-foot depth in S-B showed <br /> concentrations of total' hydrocarbons less than 50 parts per <br /> million (ppm)_•__- Theresults__of-analyses__af__water--from_wells-S-1 -- -_ <br /> and S-2 indicated that concentrations of benzene, toluene, and <br /> 3 <br /> Ai®iv/ied �eoSyste�s <br />